Question

12. If for a gas

v

R

C

= 0.67, this gas is made up of molecules which are

1) monoatomic 2) diatomic

3) polyatomic 4) mixture of diatomic and polyatomic molecules

13. The relative between internal energy U, pressure P and volume V of a gas in an adiabatic

process is U = a + b PV Where a and b are constants. What is the value of the ratio of the

specific heats?

1) a

b

2) b 1

b



3) a 1

a



4) b

a

14. A gas is compressed from a volume of 3

2m to a volume of 1mat a constant pressure of

2

100 / N m , then it is heated at constant volume by supplying 150 J of energy. As a resultant

the internal energy of the gas

1) decrease by 250 J 2) increases by 50 J 3) decrease by 50 J 4) increases by 250 J

15. A thermodynamic system is taken through the cycle PQRSP process. The net work done by

the system is

1) 20 J 2) –20J 3) 400 J 4) –374 J

16. A steel ball of mass 0.1 kg falls freely from a height of 10 m and bounces to a height of 5.4 m

from the ground. If the dissipated energy in this process is absorbed by the ball, the rise in its

temperature is (specific heat of steel 0 1 460 / / , 10 J kg C g ms

  )

1) 0

0.01 C 2) 0

0.1 C 3) 0

1 C 4) 0

1.1 C

17. If 150 J of heat is added to a system and the work done by the system is 110 J, then change in

internal energy will be

1) 260 J 2) 150 J 3) 110 J 4) 40 J

18. One mole of an ideal monoatomic gas is heated at a constant pressure of one atmosphere from

0

o C to 100oC. Then the change in the internal energy is

1) 6.56 joule 2) 8.32  102

joule 3) 12.48  102

joule 4) 20.80 102

joule

19. The slope of isothermal and adiabatic curves are related as

1) isothermal curve slope = adiabatic curve slope

2) isothermal cure slope =  adiabatic curve slope

3) adiabatic curve slope =  isothermal curve slope

4) adiabatic curve slope = ½  isothermal curve slope

20. Compressed air in the tube of a wheel of a cycle at normal temperature suddenly starts

coming out from the puncture, the air inside

1) starts becoming hotter

2) starts becoming colder

3) remain at the same temperature

4) may become hotter or colder depending upon the amount of water vapour present​

Answer 1

isko padhne mein bahut time lagega sorry dear